What problems are you having? I'm using the standard 8-pole 500hz
filter along with an audio dsp.
Dave WA0ZZG
On Fri, 15 Dec 2000, Ron Feutz wrote:
>
> I want to get better CW front end selectivity for my 990. I am
> currently using the stock 500 hz filter. Are there any options or mods
> other than the Inrad 250 hz filter for the 990, which I have on order.
> Also, is the 10.94 IF 500hz stock filter cascaded with the 250hz 455 IF
> filter? The manual doesn't say and the QST review is contradictory, with
> one mention saying they work together and another saying they are
> independent. I'm not smart enough to figure it out from the schematic.
>
> Ron - WA9IRV
>
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>
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